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v3.10.0.1

Note Employee benefits (Plan assets by fair value hierarchy) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 685,823 | $ 767,539 |
Obligations of U.S. Government sponsored entities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 172,969 | 138,287 |
Corporate bonds and debentures |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 263,644 | 291,805 |
Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 90,175 | 123,052 |
Equity securities - ETF's |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 69,029 | 103,889 |
Foreign Commingled Trust Fund |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 59,362 | 74,013 |
Mutual Funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,630 | 4,510 |
Mortgage Backed Securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 11,349 | 4,539 |
Private Equity investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 68 | 182 |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 10,573 | 22,686 |
Accrued Income Receivable |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5,024 | 4,576 |
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 140,142 | 199,848 |
Level 1 | Obligations of U.S. Government sponsored entities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 1 | Corporate bonds and debentures |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 1 | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 90,175 | 123,052 |
Level 1 | Equity securities - ETF's |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 39,394 | 54,110 |
Level 1 | Foreign Commingled Trust Fund |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 1 | Mutual Funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 1 | Mortgage Backed Securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 1 | Private Equity investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 1 | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 10,573 | 22,686 |
Level 1 | Accrued Income Receivable |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 467,103 | 473,496 |
Level 2 | Obligations of U.S. Government sponsored entities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 165,832 | 130,721 |
Level 2 | Corporate bonds and debentures |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 256,657 | 283,947 |
Level 2 | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 2 | Equity securities - ETF's |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 29,635 | 49,779 |
Level 2 | Foreign Commingled Trust Fund |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 2 | Mutual Funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,630 | 4,510 |
Level 2 | Mortgage Backed Securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 11,349 | 4,539 |
Level 2 | Private Equity investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 2 | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 2 | Accrued Income Receivable |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5,092 | 4,758 | $ 3,555
Level 3 | Obligations of U.S. Government sponsored entities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 | Corporate bonds and debentures |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 | Equity securities - ETF's |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 | Foreign Commingled Trust Fund |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 | Mutual Funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 | Mortgage Backed Securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 | Private Equity investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 68 | 182 |
Level 3 | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Level 3 | Accrued Income Receivable |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5,024 | 4,576 |
Measured at NAV |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 73,486 | 89,437 |
Measured at NAV | Obligations of U.S. Government sponsored entities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 7,137 | 7,566 |
Measured at NAV | Corporate bonds and debentures |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 6,987 | 7,858 |
Measured at NAV | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Measured at NAV | Equity securities - ETF's |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Measured at NAV | Foreign Commingled Trust Fund |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 59,362 | 74,013 |
Measured at NAV | Mutual Funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Measured at NAV | Mortgage Backed Securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Measured at NAV | Private Equity investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Measured at NAV | Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | 0 |
Measured at NAV | Accrued Income Receivable |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 0 | $ 0 |

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